I had an accident at work 2 months ago and have been diagnosed with acute muscular back pain which I'm now having to go to physio. The doctor has prescribed me co-codamol and naproxen to help with the pain. I do get some side effects when taking co-codamol ie Constapation, nausea and drowsiness but for the last couple of days I have been experiencing chest pains which is in the middle of my chest and back, it seems to be worse at night as the pain wakes me up several times. Is this a normal side affect of the medication or should I make an appointment with the doctors immediately?